US4913619A - Centrifugal pump having resistant components - Google Patents
Centrifugal pump having resistant components Download PDFInfo
- Publication number
- US4913619A US4913619A US07/229,293 US22929388A US4913619A US 4913619 A US4913619 A US 4913619A US 22929388 A US22929388 A US 22929388A US 4913619 A US4913619 A US 4913619A
- Authority
- US
- United States
- Prior art keywords
- impeller
- pump
- wear
- face
- housing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000006835 compression Effects 0.000 claims abstract description 16
- 238000007906 compression Methods 0.000 claims abstract description 16
- 229910010293 ceramic material Inorganic materials 0.000 claims abstract description 7
- 239000011159 matrix material Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 3
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 3
- 239000002002 slurry Substances 0.000 abstract description 13
- 239000000463 material Substances 0.000 description 15
- 239000000919 ceramic Substances 0.000 description 7
- 238000005299 abrasion Methods 0.000 description 6
- 239000007787 solid Substances 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 229910000760 Hardened steel Inorganic materials 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 229920006332 epoxy adhesive Polymers 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 239000008247 solid mixture Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/16—Sealings between pressure and suction sides
- F04D29/165—Sealings between pressure and suction sides especially adapted for liquid pumps
- F04D29/167—Sealings between pressure and suction sides especially adapted for liquid pumps of a centrifugal flow wheel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2261—Rotors specially for centrifugal pumps with special measures
- F04D29/2266—Rotors specially for centrifugal pumps with special measures for sealing or thrust balance
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
- F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
Definitions
- the present invention relates generally to a centrifugal pump having wear resistant elements mounted on opposing wear prone faces of an impeller shroud and a pump housing
- Centrifugal slurry pumps which include replaceable wear plates on the front and rear internal surfaces of the pump housing.
- Such replaceable wear plates are generally formed of hard, abrasion resistant material such as a hardened steel alloy.
- a cantilevered centrifugal pump is disclosed in U.S. Pat. No. 4,655,684 in which internal faces of the pump housing are case hardened for increased wear resistance.
- the present invention provides a centrifugal pump having reduced wear characteristics and a prolonged life by providing replaceable wear resistant components at the most wear prone locations in the pump.
- the invention also provides a centrifugal pump operable at optimum efficiency by controlling recirculation or leakage loss.
- the pump according to the present invention also reduces maintenance time required for impeller adjustment and for replacement of worn parts to obtain optimum pump performance.
- the invention provides an economical solution to wear in slurry pumps.
- a centrifugal pump having a shaft mounted impeller rotatably disposed within a housing wherein a first wear resistant member, or insert, is mounted in a wear prone face at a front internal surface within the housing and a second wear resistant member is mounted in an opposing wear prone face of a front shroud of the impeller.
- the wear resistant members are preferrably formed of an extremely hard, abrasion resistant material mounted in compression in the respective impeller shroud and housing surfaces. Such material is preferrably a super hard ceramic composite.
- the members, or inserts, are also preferrably replaceable to extend the life of the pump.
- the area of greatest water is the region adjacent the inlet where the impeller face is closely adjacent a stationary face of the pump housing.
- a recirculating, or leakage, flow occurs in this area as the result of reduced pressure at the inlet of the pump and increased pressure at the impeller outlet at opposite sides of this area.
- the present invention provides replaceable inserts of extremely hard material in the regions of greatest wear on the front face, or shroud, of the impeller and on an opposing region in a wear face in the pump housing.
- the inserts of the present invention are provided in the region of closest running clearance at the suction side of the impeller.
- the centrifugal pump is a cantilevered pump in which shaft runout, or lateral movement, is possible due to radial hydraulic forces operating on the impeller, the impeller being mounted on a shaft supported in bearings spaced from the impeller.
- the wear face diameter of the stationary wear resistant insert is greater than the diameter of the rotating wear resistant insert in the impeller.
- wear resistant inserts, or elements, of the instant invention are preferrably mounted in compression and, therefore, materials can be used which are hard and strong in compression but relatively weak in tension.
- wear resistant materials may include, but are not limited to, ceramic composites such as ceramic composites in the family of silicon carbide with a metal bonding matrix. Other materials, such as alloys or composites may be used in some applications.
- FIG. 1 is a cross section generally in an axial direction of a centrifugal pump according to the present invention and including wear resistant inserts;
- FIG. 2 is an enlarged fragmentary view of the impeller mounted within the pump housing from FIG. 1 having the annular wear resistant inserts;
- FIG. 3 is a perspective view of a wear resistant insert for use in the impeller shroud of the centrifugal pump shown in FIGS. 1 and 2;
- FIG. 4 is a perspective view of a second wear resistant insert for mounting opposite the insert of FIG. 3 in the centrifugal pump of FIGS. 1 and 2 according to the present invention.
- a centrifugal slurry pump according to the principles of the present invention is shown in cross section in FIG. 1, including a horizontal drive shaft 10 driven by a drive motor 12 and connected through a coupling 14 to a pump shaft 16.
- the drive shaft 16 is rotatably mounted in a pair of spaced bearing assemblies 18 and 20 along the shaft 16.
- Each of the bearings assemblies 18 and 20 include respective bearings 22 and 24 and are connected by brackets 26 and 28 to a stationary mounting location such as a horizontal mounting plate 29, which together with the brackets 26 and 28 form a mounting pedestal.
- a pump housing 30 including a seal mounting flange 32 having a plurality of seals 34 extending between the seal flange 32 and a sleeve 36 on the pump drive shaft 16.
- a front portion of the pump housing 30 forms a volute chamber 38 within which is rotatably disposed an impeller 40 mounted on the free end of the pump drive shaft 16.
- a hub cover 42 is threaded over a threaded extension 43 of the pump drive shaft 16 to hold the impeller 40 in place and a key 45 assures that the impeller 40 rotates with the shaft 16.
- an inlet housing 44 is mounted at the end of the pump housing 30 for connection to an inlet pipe (not shown).
- the preferred embodiment of the centrifugal slurry pump has a replaceable rear wear plate 46 forming a rear face of the volute impeller chamber 38 and a replaceable front wear plate 48 forming a front interior surface of the volute chamber 38.
- a plurality of bolts 50 mount the rear wear plate 46 in the pump housing 30.
- the impeller 40 when driven by the drive motor 12, rotates within the volute chamber 38 between the rear wear plate 46 and the front wear plate 48.
- the impeller 40 includes a plurality of impeller blades 54 extending substantially radially between a front impeller shroud 56 and a rear impeller shroud 58.
- the rotational motion of the impeller 40 within the volute chamber 38 generates a centrifugal force which draws liquid and/or slurry material through a centrally disposed inlet 60 in the inlet housing 454 and into the volute impeller chamber 38.
- the volute chamber 38 includes an outlet (not shown) through which pressurized liquid material is pumped.
- the pump chamber can be a double volute chamber. It is also possible that the impeller can have other shapes than that shown in FIG. 1.
- a centrifugal pump of the type shown has the greatest rate of wear on the inner portions of the front surfaces of the front impeller shroud 56 and on the opposing surface portions of the front wear plate 48.
- the present invention provides inserts 62 and 64 of highly abrasion resistant material in the impeller 40 and the front wear plate 48 at these most wear prone locations in the centrifugal pump.
- the operation of the drive motor 12 causes the pump shaft 16 to rotate the impeller 40 within the volute chamber 38, thereby generating a flow of liquid through the pump.
- the liquid contains solid particles, such as, for example, when a slurry is being pumped, then the liquid-carried solids wear down the surfaces in contact with the flow. The higher the flow rate, the higher the wear rate. Wear occurs on the impeller 40 itself, on the rear wear plate 46, and on the front wear plate 48. However, the rate of wear on the front wear plate 48 for an exemplary centrifugal pump is approximately three times greater than the wear rate on the rear wear plate 46.
- the region having the greatest wear rate is an area 65 of closest running tolerance between the face of the front impeller shroud 56 and an annular surface region of the front wear plate 48 immediately adjacent the inlet opening 60.
- the rear wear plate 46 and the front wear plate 48 as well as the impeller 40 are generally formed of relatively durable, wear resistant materials, such as hardened steel and the like.
- relatively durable, wear resistant materials such as hardened steel and the like.
- the inserts 62 and 64 of the present invention are formed of an extremely hard and durable ceramic composition so that the wear rate at the region 65 at least approximates that in other areas of the pump. Since ceramics in general, and particularly those which have the requisite hardness and durability for use in the present application, are expensive and quite difficult to form into complex shapes, the present invention provides that the quantity of material used for the present inserts is minimal and that the shapes are as simple as possible.
- the present inserts 62 and 64 are mounted at the wear prone region 65 in compression.
- the front insert 64 is preferrably of a continuous annular shape of rectangular cross section and is mounted in compression in a similar size annular notch or channel 66 formed in the front wear plate 48.
- An outside surface 68 of the insert 64 tightly abuts a radially inwardly directed notch face 70 of the notch 66 to maintain the ceramic insert 64 in a stable, compressed condition.
- Irregularities in the notch 66 and insert 64, such as in shape and surface condition, should be eliminated to assure that the compression forces are substantially equal about the entire circumference of the annular insert 64.
- the insert 64 When mounted as described, the insert 64 presents a wear face 72 directed toward the impeller 40. Fluid pressures in the region 65 act to compress the insert 64 axially against an axially directed notch face 74. Thus, the insert is in compression both radially and axially during operation of the pump.
- the insert 62 is provided at an opposing face of the front impeller shroud 56 and is likewise mounted in compression.
- the insert 62 is of a continuous annular shape but differs from the insert 64 in that it has an "L-shaped" cross section.
- An axially directed leg 76 of the "L” is mounted in compression in an annular channel or notch 78 formed in the front shroud 56 of the impeller 40.
- the impeller insert 62 also includes a radially extending flange or leg 80 of the "L” extending across the front of the front shroud 56 and in axial compression due to fluid pressures in the region 65 acting on a face 82 of the insert 62.
- the inserts 62 and 64 be mounted in compression in the pump of the present invention since a preferred material of which the inserts are formed is a hard ceramic material.
- a hard ceramic material is in the family of silicon carbide with a metal bonding matrix as made by Alanx Products, L.P.
- Such ceramic materials offer the advantages of extreme abrasion resistance and strength in compression, although weakness in tension.
- inserts of a material which does not require mounting in compression may be used, so long as resistance to abrasion and wear are provided.
- An alternate means for mounting the inserts 62 and 64 is to provide a somewhat looser fit between the inserts 62 and 64 and the corresponding notches 78 and 66 and instead to bond the inserts 62 and 64 therein, such as by an epoxy adhesive.
- Other means for mounting the inserts 62 and 64 are also contemplated, including rivets or threaded fasteners.
- the inserts 62 and 64 are shown before insertion in the respective notches 78 and 66 in the pump. They each have a relatively simple shape and are made with a minimal amount of the abrasion resistant material and are therefore economical. When the inserts 62 and 64 become worn or damaged, they can be easily replaced so that the efficiency of the pump is maintained without costly replacement of the impeller 40 and housing parts. However, due to the extreme hardness of the inserts 62 and 64, the wear rate is reduced considerably and replacement is much less frequent than with known devices.
- the drive shaft 16 rides on the bearings 24 which are spaced from the impeller 40 so that the impeller 40 is of a cantilevered design.
- a cantilevered centrifugal pump design permits larger solids to pass through the pump without damaging the impeller 40 and other pump components during pump being of a heavy slurry, for example,
- the impeller 40 is subject to lateral movements due, in part, to radial hydraulic forces and/or solids in the fluid flow acting on the impeller 40.
- the front insert 64 of the preferred embodiment has the wear face 72 of greater diametrical extent then the opposing front face 82 of the insert 62 in the front shroud 56 of the impeller 40 to accommodate shaft runout or flexture due to the antilevered design of the disclosed pump. As a result, wear is prevented beyond the outside edge of the wear face 72, which preferrably extends at least to the maximum foreseeable lateral position of the wear face 82.
- an improved centrifugal slurry pump of a cantilevered design having wear resistant annular inserts 62 and 64 in the front shroud 56 of the impeller 40 and in the front wear face 48 in the pump housing 30.
- the disclosed pump provides optimum efficiency by controlling recirculation or leakage loss in the region 65 and, therefore, reducing energy costs in the operation of the pump.
- the present pump also reduces the maintenance time and cost in adjusting the impeller for optimum performance by axial adjustment of the bearings 24 in the housing 20, and in replacing worn parts of the impeller 40 and pump housing 30.
Abstract
Description
Claims (4)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/229,293 US4913619A (en) | 1988-08-08 | 1988-08-08 | Centrifugal pump having resistant components |
GB9000529A GB2239902B (en) | 1988-08-08 | 1990-01-10 | Centrifugal pump having wear resistant components |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/229,293 US4913619A (en) | 1988-08-08 | 1988-08-08 | Centrifugal pump having resistant components |
Publications (1)
Publication Number | Publication Date |
---|---|
US4913619A true US4913619A (en) | 1990-04-03 |
Family
ID=22860592
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/229,293 Expired - Lifetime US4913619A (en) | 1988-08-08 | 1988-08-08 | Centrifugal pump having resistant components |
Country Status (2)
Country | Link |
---|---|
US (1) | US4913619A (en) |
GB (1) | GB2239902B (en) |
Cited By (45)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5133639A (en) * | 1991-03-19 | 1992-07-28 | Sta-Rite Industries, Inc. | Bearing arrangement for centrifugal pump |
US5141416A (en) * | 1991-02-14 | 1992-08-25 | Dover Resources, Inc. | Plunger for a downhole reciprocating oil well pump and the method of manufacture thereof |
US5190450A (en) * | 1992-03-06 | 1993-03-02 | Eastman Kodak Company | Gear pump for high viscosity materials |
DE4326545A1 (en) * | 1993-08-07 | 1995-02-09 | Klein Schanzlin & Becker Ag | Centrifugal pump with one or more wearing walls |
DE19731619C1 (en) * | 1997-07-23 | 1999-02-04 | Werner Dipl Ing Arnswald | Open channel wheel |
US5971704A (en) * | 1997-04-23 | 1999-10-26 | Toyo Pumps North America Corporation | Device for adjusting the running clearance of an impeller |
US6004094A (en) * | 1998-05-20 | 1999-12-21 | Termomeccanica S.P.A. | Radially sealed centrifugal pump |
US6095771A (en) * | 1995-12-30 | 2000-08-01 | Robert Bosch Gmbh | Fuel-feed unit |
US6095754A (en) * | 1998-05-06 | 2000-08-01 | Applied Materials, Inc. | Turbo-Molecular pump with metal matrix composite rotor and stator |
US6234748B1 (en) * | 1998-10-29 | 2001-05-22 | Innovative Mag-Drive, L.L.C. | Wear ring assembly for a centrifugal pump |
US20020195147A1 (en) * | 2001-06-22 | 2002-12-26 | Kenneth Nixon | Serviceable check valve |
US20030012642A1 (en) * | 2001-07-03 | 2003-01-16 | Soja Marc S. C. | Adjustable pump wear plate positioning assembly |
US20040228725A1 (en) * | 2002-12-19 | 2004-11-18 | Honeywell International Inc. | Replaceable insert for centrifugal blower flow control |
US20050095124A1 (en) * | 2003-10-31 | 2005-05-05 | The Gorman-Rupp Co. | Impeller and wear plate |
US20050095146A1 (en) * | 2003-10-31 | 2005-05-05 | Denso Corporation | Fuel feed apparatus with reinforcing structure |
US20050123395A1 (en) * | 2003-12-03 | 2005-06-09 | Addie Graeme R. | Self-compensating clearance seal for centrifugal pumps |
US20080152476A1 (en) * | 2006-12-20 | 2008-06-26 | Ricardo Abarca Melo | Pump wet end replacement method and impeller fixing mechanism |
US20100092276A1 (en) * | 2008-09-30 | 2010-04-15 | John Cartwright | Chopper pump |
US20100239419A1 (en) * | 2009-03-20 | 2010-09-23 | Dresser-Rand Co. | Slidable cover for casing access port |
US20100296921A1 (en) * | 2008-11-26 | 2010-11-25 | Cottrell Matthew A | Socket with Bearing Bore and Integrated Wear Plate |
US20110056707A1 (en) * | 2009-09-08 | 2011-03-10 | Jonathan Gamble | Fire-Extinguishing System and Method for Operating Servo Motor-Driven Foam Pump |
US20110056708A1 (en) * | 2009-09-08 | 2011-03-10 | Jonathan Gamble | Fire-Extinguishing System with Servo Motor-Driven Foam Pump |
US20110057595A1 (en) * | 2009-09-08 | 2011-03-10 | Ron Flanary | Method of Controlling a Motor |
US20110064566A1 (en) * | 2008-05-15 | 2011-03-17 | Uwe Wuerdig | Apparatus for impeller sealing in centrifugal pumps |
US20110164973A1 (en) * | 2008-06-13 | 2011-07-07 | Glenn Raymond Smith | Pump housing support |
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US8183810B2 (en) | 2009-09-08 | 2012-05-22 | Hoffman Enclosures, Inc. | Method of operating a motor |
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WO2013025291A1 (en) * | 2011-07-01 | 2013-02-21 | Itt Manufacturing Enterprises, Llc | Method and apparatus for adjusting impeller-sealing ring clearance in a pump |
CN103016354A (en) * | 2012-12-06 | 2013-04-03 | 大耐泵业有限公司 | Wear-resistant centrifugal pump |
US20130156545A1 (en) * | 2010-06-16 | 2013-06-20 | Allweiler Gmbh | Dual-flow centrifugal pump |
RU2503850C1 (en) * | 2012-09-27 | 2014-01-10 | Открытое акционерное общество "ЭНТЕХНО" | Model series of electrically drive horizontal pumps |
RU2503851C1 (en) * | 2012-09-27 | 2014-01-10 | Открытое акционерное общество "ЭНТЕХНО" | Horizontal electrically driven pump unit |
RU2503856C1 (en) * | 2012-09-27 | 2014-01-10 | Открытое акционерное общество "ЭНТЕХНО" | Method of electrically driven pump unit production and electrically drive pump unit thus made (versions) |
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US20140064929A1 (en) * | 2012-08-31 | 2014-03-06 | John D. Adams | Cutter apparatus for centrifugal pump |
DE102012108357A1 (en) * | 2012-09-07 | 2014-03-13 | Herborner Pumpenfabrik J. H. Hoffmann Gmbh & Co. Kg | Centrifugal pump and impeller protector for centrifugal pump |
CN103703254A (en) * | 2011-07-20 | 2014-04-02 | 伟尔矿物澳大利亚私人有限公司 | Improvements to pumps and components therefor |
US20140377055A1 (en) * | 2012-08-31 | 2014-12-25 | Cornell Pump Company | Cutter System for Pump Suction |
RU2559950C2 (en) * | 2010-06-09 | 2015-08-20 | КСИЛЕМ АйПи ХОЛДИНГЗ ЭлЭлСи | Suction joint intended for suction pipe connection with dry-installed centrifugal pump |
US20160222976A1 (en) * | 2013-09-10 | 2016-08-04 | Schlumberger Technology B.V. | Wear rings for electric submersible pump stages |
US9488184B2 (en) | 2012-05-02 | 2016-11-08 | King Abdulaziz City For Science And Technology | Method and system of increasing wear resistance of a part of a rotating mechanism exposed to fluid flow therethrough |
CN108331782A (en) * | 2018-01-29 | 2018-07-27 | 陈恒平 | A kind of centrifugal pump closed type impeller |
EP3156654B1 (en) | 2015-10-14 | 2019-12-18 | Sulzer Management AG | Centrifugal pump for conveying a highly viscous fluid |
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---|---|---|---|---|
HU217252B (en) * | 1991-03-22 | 1999-12-28 | Warman International Ltd. | Centrifugal slurry pump |
DE20013350U1 (en) * | 2000-08-03 | 2000-12-28 | Assoma Inc | pump |
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-
1988
- 1988-08-08 US US07/229,293 patent/US4913619A/en not_active Expired - Lifetime
-
1990
- 1990-01-10 GB GB9000529A patent/GB2239902B/en not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
GB9000529D0 (en) | 1990-03-14 |
GB2239902B (en) | 1994-04-20 |
GB2239902A (en) | 1991-07-17 |
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